The Mini Coil throws a 3" spark Power is a 9/18 NST

Gap is 0.1" static blown Primary is 3" ID and 7" OD pancake of coax cable

Secondary is 1 1/2" diameter and 5" long acrylic, wound with 950 turns of #36awg Capacitor is 2.3 nf

Toroid is an egg-sized rock wrapped in al. foil